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                                <p><strong>&#x4E3B;&#x952E;</strong></p>
<ol>
<li><p>primary key &#x7528;&#x6765;&#x552F;&#x4E00;&#x7684;&#x7EA6;&#x675F;&#x5B57;&#x6BB5;&#x91CC;&#x9762;&#x7684;&#x6570;&#x636E;, &#x4E0D;&#x80FD;&#x91CD;&#x590D;, &#x4E0D;&#x80FD;&#x4E3A;&#x7A7A;, &#x4E00;&#x5F20;&#x53EA;&#x80FD;&#x6709;&#x4E00;&#x4E2A;&#x4E3B;&#x952E;, &#x800C;&#x4E14;&#x4E3B;&#x952E;&#x6240;&#x5728;&#x7684;&#x5217;&#x901A;&#x5E38;&#x662F;&#x6574;&#x6570;&#x7C7B;&#x578B;.</p>
</li>
<li><p>&#x4E3B;&#x952E;&#x7684;&#x521B;&#x5EFA;</p>
<ol>
<li><p>&#x5355;&#x952E;: &#x521B;&#x5EFA;&#x8868;&#x65F6;&#x5019;&#x76F4;&#x63A5;&#x5728;&#x5B57;&#x6BB5;&#x7684;&#x4E0A;&#x6307;&#x5B9A;&#x4E3B;&#x952E;</p>
<pre><code class="lang-mysql">CREATE TABLE xuanke(
    sid INT PRIMARY KEY,
    cid INT,
    score INT
);
</code></pre>
</li>
<li><p>&#x590D;&#x5408;&#x4E3B;&#x952E;: &#x5728;&#x521B;&#x5EFA;&#x8868;&#x7684;&#x65F6;&#x5019;,&#x5728;&#x6240;&#x6709;&#x5B57;&#x6BB5;&#x4E4B;&#x540E;, &#x4F7F;&#x7528; primary key(&#x4E3B;&#x952E;&#x5B57;&#x6BB5;&#x5217;&#x8868;) &#x6765;&#x521B;&#x5EFA;&#x4E3B;&#x952E;,&#x591A;&#x4E2A;&#x5B57;&#x6BB5;&#x4F5C;&#x4E3A;&#x4E3B;&#x952E;,&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x7B26;&#x5408;&#x4E3B;&#x952E;</p>
<pre><code class="lang-mysql">CREATE TABLE xuanke(
    sid INT ,
    cid INT,
    score INT,
    PRIMARY KEY(sid, cid)
);
</code></pre>
</li>
<li><p>&#x8FFD;&#x52A0;&#x4E3B;&#x952E;: &#x5728;&#x521B;&#x5EFA;&#x8868;&#x65F6;&#x5019;&#x53EF;&#x4EE5;&#x8FFD;&#x52A0;&#x4E3B;&#x952E;</p>
<pre><code class="lang-mysql">alter table stu add primary key (sid);
# &#x4E3B;&#x952E;&#x6240;&#x5728;&#x7684;&#x5217;&#x4E0D;&#x80FD;&#x4E3A;&#x91CD;&#x590D;, &#x4E0D;&#x80FD;&#x4E3A;&#x7A7A;
</code></pre>
</li>
<li><p>&#x5220;&#x9664;&#x4E3B;&#x952E;:</p>
<pre><code class="lang-mysql">alter table stu drop primary key;
</code></pre>
</li>
</ol>
</li>
</ol>
<p><strong>&#x5916;&#x952E;</strong></p>
<ul>
<li><p>&#x4E3B;&#x952E;: &#x8868;&#x4E2D;&#x7684;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x5B57;&#x6BB5;,   &#x5B83;&#x7684;&#x503C;&#x7528;&#x4E8E;&#x552F;&#x4E00;&#x6807;&#x8BC6;&#x8868;&#x4E2D;&#x7684;&#x67D0;&#x4E00;&#x6761;&#x8BB0;&#x5F55;</p>
</li>
<li><p>&#x5916;&#x952E;: &#x662F;&#x4E24;&#x4E2A;&#x8868;&#x6570;&#x636E;&#x4E4B;&#x95F4;&#x5EFA;&#x7ACB;&#x7684;&#x8FDE;&#x63A5;&#x65B9;&#x5F0F;. &#x53EF;&#x4EE5;&#x662F;&#x4E00;&#x5217;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;&#x591A;&#x5217;, &#x4E00;&#x4E2A;&#x8868;&#x4E2D;&#x53EF;&#x4EE5;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A; &#x5916;&#x952E;</p>
</li>
<li>&#x5916;&#x952E;&#x540D;: &#x5B9A;&#x4E49;&#x5916;&#x952E;&#x7EA6;&#x675F;&#x7684;&#x540D;&#x79F0;,  &#x4E00;&#x4E2A;&#x8868;&#x4E2D;&#x4E0D;&#x80FD;&#x6709;&#x76F8;&#x540C;&#x540D;&#x79F0;&#x7684;&#x5916;&#x952E;&#x540D;</li>
<li>&#x5B57;&#x6BB5;&#x540D;: &#x8868;&#x793A;&#x8981;&#x8868;&#x6DFB;&#x52A0;&#x7684;&#x5916;&#x952E;&#x5B57;&#x6BB5;</li>
</ul>
<p>&#x5916;&#x952E;&#x7684;&#x4E00;&#x4E9B;&#x7279;&#x5B9A;&#x53CA;&#x89C4;&#x5B9A;&#xFF1A;</p>
<p>&#xFF08;1&#xFF09;&#x4E00;&#x4E2A;&#x8868;&#x7684;&#x5916;&#x952E;&#x53EF;&#x4EE5;&#x662F;&#x7A7A;&#x503C;&#xFF0C;&#x82E5;&#x4E0D;&#x4E3A;&#x7A7A;&#x503C;&#xFF0C;&#x5219;&#x6BCF;&#x4E00;&#x4E2A;&#x5916;&#x952E;&#x503C;&#x5FC5;&#x987B;&#x7B49;&#x4E8E;&#x53E6;&#x5916;&#x4E00;&#x4E2A;&#x8868;&#x4E2D;&#x7684;&#x4E3B;&#x952E;&#x7684;&#x67D0;&#x4E2A;&#x503C;&#x3002;
&#xFF08;2&#xFF09;&#x5916;&#x952E;&#x662F;&#x4E00;&#x4E2A;&#x8868;&#x4E2D;&#x7684;&#x5B57;&#x6BB5;&#xFF0C;&#x4ED6;&#x53EF;&#x4EE5;&#x4E0D;&#x662F;&#x672C;&#x8868;&#x4E2D;&#x7684;&#x4E3B;&#x952E;&#xFF0C;&#x4F46;&#x5BF9;&#x5E94;&#x53E6;&#x5916;&#x4E00;&#x4E2A;&#x8868;&#x7684;&#x4E3B;&#x952E;&#xFF0C;&#x5916;&#x952E;&#x7684;&#x4F5C;&#x7528;&#x662F;&#x4FDD;&#x8BC1;&#x6570;&#x636E;&#x5F15;&#x7528;&#x7684;&#x5B8C;&#x6574;&#x6027;&#x3002;
&#xFF08;3&#xFF09; &#x4ECE;&#x8868;&#x5916;&#x952E;&#x7C7B;&#x578B;&#xFF0C;&#x5FC5;&#x987B;&#x4E0E;&#x4E3B;&#x8868;&#x4E3B;&#x952E;&#x7C7B;&#x578B;&#x4E00;&#x81F4;&#x3002;</p>
<p><strong>&#x5916;&#x952E;&#x7684;&#x521B;&#x5EFA;:</strong></p>
<pre><code class="lang-mysql">CREATE TABLE xuanke(
    sid INT PRIMARY KEY,
    cid INT,
    score INT,
    constraint [&#x5916;&#x89C1;&#x540D;] foreign key(sid) references stu1(sid);
);
</code></pre>
<p><strong>&#x8FFD;&#x52A0;&#x5916;&#x952E;</strong></p>
<pre><code class="lang-mysql">alter table t2 constraint [&#x5916;&#x89C1;&#x540D;] foreign key(sid) references t1(sid);
</code></pre>
<p><strong>&#x5220;&#x9664;&#x5916;&#x952E;</strong></p>
<pre><code class="lang-mysql">alter table t2 drop foreign key [&#x5916;&#x89C1;&#x540D;];
# &#x5916;&#x952E;&#x540D;&#x53EF;&#x4EE5;&#x7528; show create table t2; &#x6765;&#x627E;&#x5230;
</code></pre>
<p>&#x5408;&#x5E76;&#x7ED3;&#x679C;</p>
<p>union : &#x53BB;&#x9664;&#x91CD;&#x590D;&#x8BB0;&#x5F55;</p>
<p>union all : &#x4FDD;&#x7559;&#x6240;&#x6709;&#x6570;&#x636E;</p>
<pre><code class="lang-mysql">select * from stu1 union select * from stu2;
</code></pre>
<p>&#x8FDE;&#x63A5;&#x67E5;&#x8BE2;</p>
<pre><code class="lang-mysql">select * from t1,t2;

# t1&#x8868;10&#x6761;&#x6570;&#x636E; t2&#x8868; 4 &#x6761;&#x6570;&#x636E; 
# &#x6700;&#x7EC8;&#x4EA7;&#x751F; 10*4 &#x6761;&#x6570;&#x636E;
</code></pre>
<p>&#x5185;&#x8FDE;&#x63A5;</p>
<p>&#x5916;&#x8FDE;&#x63A5;</p>
<p>&#x81EA;&#x7136;&#x8FDE;&#x63A5;</p>
<p>&#x81EA;&#x7136;&#x5185;&#x8FDE;&#x63A5;</p>
<p>&#x81EA;&#x7136;&#x5DE6;&#x8FDE;&#x63A5;</p>
<p>&#x81EA;&#x7136;&#x53F3;&#x8FDE;&#x63A5;</p>
<p>&#x6570;&#x636E;&#x5E93;&#x5907;&#x4EFD;&#x548C;&#x6062;&#x590D;</p>

                                
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